Siemens LGB3K030B Molded Case Circuit Breaker
- 30A
- 3 Pole
- Bolt-On
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Siemens LGB3K030B - 30A 3 Pole Molded Case Circuit Breaker
New
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Description
Designed for heavy-duty applications, the Siemens LGB3K030B is a 3-pole, 30A molded case circuit breaker. It provides essential long-time and instantaneous protection through its fixed thermal-magnetic trip unit. This unit mounts into Siemens P1, P2, and P3 commercial panelboards via a secure bolt-on connection. It replaces older LGB models, though the updated 3VA5130 substitute requires a mounting strap kit. Capable of handling 65kAIC at 480Y/277V, this breaker is HACR and HID rated.Specifications
| Brand | Siemens |
|---|---|
| Series | LGB |
| Amperage | 30A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 600Y/347VAC, 125/250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 25kA @ 600Y/347VAC, 14kA @ 125/250VDC |
| Frame Type | LGB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3 Panelboards |
| Wire Gauge | 14-6 AWG (Cu), 12-6 AWG (Al) |
| Max Wire | 6 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, HID Rated, Reverse Feed, Non-Interchangeable Trip, Quick-Make/Quick-Break, Trip-Free Mechanism, Common Trip |
Product FAQs
6 answersWhich panelboards are compatible with the LGB3K030B circuit breaker?
This bolt-on breaker is designed specifically for use in Siemens P1, P2, and P3 commercial panelboards.
What wire sizes and materials are accepted by the lugs on this breaker?
The factory-installed lugs accept 14 to 6 AWG copper conductors or 12 to 6 AWG aluminum conductors.
How does the interrupting capacity scale across different voltage applications?
The maximum fault current this breaker can safely interrupt depends on the system voltage. It is rated for 100kA at 240VAC, 65kA at 480VAC, 25kA at 600VAC, and 14kA in DC applications up to 250VDC.
How is the LGB3K030B secured within the panelboard?
It utilizes a bolt-on mounting configuration, which provides a secure, vibration-resistant connection directly to the busbar in compatible Siemens distribution panels.
Can the trip curve be adjusted for specific motor or equipment loads?
No, this breaker utilizes a fixed thermal magnetic trip unit. Both the long-time overload and instantaneous short-circuit functions are factory set for standard 30A branch or feeder circuit protection.
What is the recommended replacement series for the phased-out LGB3K030B?
Siemens recommends the 3VA41 series, specifically catalog number 3VA41306ED340AA0, as the direct successor for this 30A GB-frame breaker.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
- RSRon S.Verified BuyerReviewingSiemens LGB3B045B - 45A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/27/26Siemens Breaker
The breaker was exactly what I needed, and it came within a couple days. The price was in line of what it should’ve been. This was my third purchase from Super Breakers. I will definitely use them again in the future.